How come before the Anglo Saxons, hististiors call the native people of England "British"?

there were many tribes in britain the names are probably locked the depths of roman history but a few survive. there is a theory that the b is a mistake and should have been pritish. the parisians settled in many parts of eastern england it seems the british and french were friendly in those days. the romans recorded that britain was always a populous place and they admired their inter-tribal cooperation. the most numerous were the briganteans of northern england. there was a tribe called the british that occupied strathclyde - cumbria and southern scotland they were celtic. the celts were an early caucasian race and culture that swept west through europe. welsh and german have very similar sounds and german, nordic and british celt mythology tells a very similar story. the celts mainly occupied the western britain and europe spain, basque, brittany, cornwall, wales, cumbria, caledonia, pict, scot and ireland. western britain is warmer. there was an established trade with them all. the original english were still in the main and still here and always had an island zenophobic view. all invaders had to drop the feminine and masculine terms. they were famous for resistance and probably escaped the worse of the viking raids. the saxons, angles, jutes had invaded and settled and it was these settlements that bore the brunt of the danes and viking. alfred the great called upon the original english that kept to woods and bog to come out and fight the vikings which they did. pastoral britain is recent phenomena as it was mostly covered in forest. in 1066 it was viking against viking and saxon many of the settled vikings fought at stamford bridge in yorkshire for harold who was saxon and again at hastings the normans being viking that had settled in france. celtic culture and art has been a great influence to the present. britons are considered to be a land of micronations that still exists today but as throughout the past hidden, but not to the britons